I'm creating a reminder application that will show notifications on scheduled time, I'll be storing reminder related data in a database and created the working database and content provider for it, initially I thought of creating an alarm whenever user creates a new reminder, but now I'm not able to fire the notification whenever the alarm triggers, and don't know how can I retrieve the reminder related info from the database, and for repeating reminders like daily or weekly I want to reschedule the same alarm after it triggers as the android developer docs suggested so, but don't have the exact idea of it. Please guide me through this which approach will be better and is there any other better way to do it, and any working demo will be very helpful.
This seems like it is quite a few questions bundled up into one. I would suggest searching for each individual piece as all of the answers to your questions are on this site.
In any case, I copied over an answer on how to set a repeating alarm
AlarmManager am = (AlarmManager) ct.getSystemService(Context.ALARM_SERVICE);
Intent intent1 = new Intent(CurrentActivity.this, Alarm.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(ct, 0,intent1, PendingIntent.FLAG_CANCEL_CURRENT);
Date curr=new Date();
curr.setHours(h);
curr.setMinutes(m);
c.setTime(curr);
c.set(Calendar.SECOND, 0);
Calendar c1 = Calendar.getInstance();
am.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
With this code an intent will be fired every day that calls Alarm.class. It is up to you to figure out if you need a service, intent, or anything else as Alarm.class, as it is unclear what the alarm needs to do based on your description.
Related
I'm trying to create a function in my App, which notifies the user at the expiration day of his rented books. I'll work with checkboxes in a listview, as below:
(Dates are for show purposes only)
Now i'm wondering how can i do it the best way. I'm having experiences with AlarmManager and BroadcastReceivers, but I didn't get a clear flowchart yet.
Thats because I need to set an specific alarm to each book and cancel that specific alarm when requested. Also, it needs to reactivate all Alarms when device is restared (by calling BOOT_COMPLETE broadcast).
PS.: Alarms will usually be set to one week after current date.
PS2.: Can I use Calendar to do it? I mean, this way i wouldn't have to reactivate all alarms, or calculate (expirationDate - currentDate) in millis.
Can someone, who has an idea, try to show me the way? Thanks!
I think the key would be to give each and every book its own alarm id as soon as you set the alarm for this book for the first time.
Then you should keep a list of the running alarm ids and timestamps (maybe in SharedPreferences).
With a method like this you can cancel a specific alarm with regards to its alarm id:
public static void cancelAlarm(Context context, int alarmId) {
PendingIntent pi = PendingIntent.getService(context, alarmId,
new Intent(context, YourService.class),
PendingIntent.FLAG_NO_CREATE);
if(pi!=null) {
AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
am.cancel(pi);
}
}
When you receive the BOOT broadcast, you can get the list of alarm ids together with timestamps from SharedPreferences and start all the alarms with their respective alarm ids
I am writing an application in which user can configure alerts/alarms. At this point, I have everything working expect the one. I am firing off an alarm using
Intent alarmIntent = new Intent(AlarmClock.ACTION_SET_ALARM);
alarmIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
alarmIntent.putExtra(AlarmClock.EXTRA_MESSAGE, "Some message!");
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MINUTE, 1);
alarmIntent.putExtra(AlarmClock.EXTRA_HOUR, calendar.get(Calendar.HOUR_OF_DAY));
alarmIntent.putExtra(AlarmClock.EXTRA_MINUTES, calendar.get(Calendar.MINUTE));
alarmIntent.putExtra(AlarmClock.EXTRA_SKIP_UI, true);
context.startActivity(alarmIntent);
I want to remove this alarm once user has dismissed using the Dismiss button. I can see the alarms being still there in the alarm clock which I set using above code through my application.
Is there some way to get a cursor or something similar on the alarms being there in the alarm clock? This will help me iterate over them and remove the ones I want.
Any help would be appreciated, Thanks in advance.
As it was answered here: there is no supported API to this.
Official documentation says that
If a time of day is specified, and EXTRA_SKIP_UI is true, and the
alarm is not repeating, the implementation should remove this alarm
after it has been dismissed.
But different manufactures implement their own alarm clocks and I'm not sure if someone supporrts this.
I have tried it on JB emulator and looks like it dosen't work. Maybe, on KitKat?
Only this one is ok on JB:
If an identical alarm exists matching all parameters, the implementation
may re-use it instead of creating a new one
So, maybe, better solution is to use youre own alarm, created with AlarmManager or warn user that he has to remove Alarms by hands (to make it more obvious - not use AlarmClock.EXTRA_SKIP_UI).
call method cancel(...) from AlarmManager, using the same PendingIntent you used to set the alarm. Example:
mAlarmPendingIntent = PendingIntent.getActivity(this, requestCode, intent, flags);
this.getAlarmManager().cancel(mAlarmPendingIntent);
this refers to the Activity or the Service from which you are cancelling the alarm
I'm building a reminders application where one time, weekly, monthly reminders and we notify the user of the reminder on due date and time. Reminders can be updated any time by the user to update the reminding time or delete the reminder altogether. I have thought of two ways I can solve the particular problem.
Whenever user sets a reminder, schedule an alarm accordingly with an unique Id and update or delete it in case user updates or deletes the alarm.
Since I store the reminding time in DB, better approach would be to schedule an alarm for the nearest reminder. And have the Service which is triggered by the alarm schedule a new alarm for the next nearest reminder.
2nd approach seems clean approach but how do we tackle the case where the Service triggered by alarm gets killed by the system before it schedules a new alarm for the next reminder?
Edit
Looks like if the system kills a Service for memory, it will re-create the Service. Does it mean it is safe to rely on the Service to schedule alarm every time it is run?
Edit 2
I've realized that Android kills any alarms whenever the device is restarted. This makes approach 2 a better solution. I've implemented it for now.
The pending intent needs to be created exactly in the same way for canceling the already set alarm. You can cancel previous alarm when you set a new alarm, if you want to have a single alarm activated at some time.
For setting alarm use:
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 1, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC, now.getTimeInMillis(), pendingIntent);
For canceling the alarm use:
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent myIntent = new Intent(getApplicationContext(), SessionReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 1, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.cancel(pendingIntent);
in my application users are free to select time and date to set alarms .
What will happen if user choose exactly the same date and time for two alarms.
I am taking input from user(for date and time) and setting the alarm.
GregorianCalendar gc=new GregorianCalendar();
gc.set(2012, 1, 22, 11, 19,0);//values as given by the user
final Intent intent = new Intent(this, AlarmService.class);
gc.set(Calendar.AM_PM,0);
// final PendingIntent sender = PendingIntent.getBroadcast(this, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
am.set(AlarmManager.RTC_WAKEUP, gc.getTimeInMillis(),PendingIntent.getBroadcast(this,1, intent, PendingIntent.FLAG_UPDATE_CURRENT));
I have used a broadcastreceiver to recieve the alarm broadcast.
How should I handle this situation. What should I prefer to do?
I want to know the tecchnical aspect as what happens in this situation.
AFAIK,it won't create any technical problem for alarms set for the same time.It will fire all alarms at the same time.
It depends upon you how you want your user to set alarm.If you want them to set same time for various alarms,it's not a problem.
But if you don't want them to repeat the alarm time once it is set for other,then you can store alarms' time in database and at the time of setting new one,you can check for the conflict of newly set alarm time with previously set alarms from database and reject if it is found same.
Well I am trying to develop a memo or notebook app with a new feature of reminding the users in certain date and time they set.
I used datepicker and timepicker to pick up date and time, and I use alarmmanager to set an alarm to notify the users, but I don't know how to check the date, could anyone help me?
THX
PS, is there any opensource android apps about it? I would like to know
You can use AlarmManager class to schedule reminders. It allow you to schedule your application to be run at some point in the future. Here's a sample code to get you started:
Intent intent = new Intent(this, YourMemoService.class);
PendingIntent pending = PendingIntent.getService(this, 0, intent, 0);
AlarmManager alarm = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
alarm.set(AlarmManager.RTC_WAKEUP, Time_To_wake, pending);